Ecology Levels
Put the six levels of ecological organization in order from smallest to largest.
Organism, population, community, ecosystem, biome, biosphere.
Are plants biotic or abiotic factors?
Biotic Factors
What do arrows in a food chain show?
The direction energy moves, pointing toward the organism receiving the energy.
Which trophic level has the most available energy?
Producers
What is symbiosis?
A close relationship between two different species.
What is a population?
A group of organisms of the same species living in the same area.
Name two abiotic factors in an ecosystem.
Ex: Water, air, soil, rocks, sunlight.
What is a producer?
An organism that makes its own food, usually using sunlight.
About what percentage of energy passes from one trophic level to the next?
10%
In mutualism, how are the two organisms affected?
They both benefit.
What is a community?
All the populations of different species living in an area.
What is a biotic factor?
Any living part of an ecosystem.
What is the difference between a food chain and a food web?
A food chain shows one pathway of energy transfer, while a food web shows interconnected feeding relationships.
If producers have 1,000 energy units, how many energy units reach the primary consumers?
100 energy units.
In parasitism, how are the two organisms affected?
One organism benefits and the other is harmed.
Which level of ecological organization includes living and nonliving factors interacting?
Ecosystem
A forest is affected by a wildfire. What type of factor is fire?
Abiotic
Name one example of a primary consumer in a land ecosystem.
Ex: Mouse, grasshopper, deer,
If producers have 9,000 energy units, how many energy units reach the tertiary consumers?
9 energy units.
In commensalism, how are the two organisms affected?
One benefits and the other is unaffected.
What is the largest level of ecological organization?
Biosphere?
Which ecological level contains only biotic factors: a community or an ecosystem?
Community
If frogs are removed from a food web and frogs eat grasshoppers, what could happen to the grasshopper population?
The grasshopper population could increase because fewer frogs are eating them.
What happens to the other 90% of energy not transferred to the next trophic level?
It is lost as heat, and through metabolism.
A flea lives on a dog and feeds on its blood. What type of symbiosis is this?
Parasitism